Vehicle supporting rack



June 22, 1965 M. H. LILI.

VEHICLE SUPPORTING RACK 8 Sheets-Sheet 1 Filed Aug. 18. 1961 MELVlN H. LILL ATTORNEY INVENTOR ATTORNEY June 22, 1965 M. H. LILI.

VEHICLE SUIPORTING RACK 8 Sheets-Sheet 2 Filed Aug. 18. 1961 MELVIN H. LILL June 22, 1965 M. H. LILL. 3,190,395

, VEHICLE SUPPORTING RACK Filed Aug. 18, 1961 8 Sheets-Sheet 5 I El *F'IE E 25! 246b INVENTOR NELVIN H. LILL ATTORNEY June 22, 1965 M. H. LILI. 3,190,395

VEHICLE SUPPORTING RACK Filed Aug. 1s. 1961 s sheets-sheet 4 INVENTOR MELVIN H. LILL ATTORNEY June 22, 1965 M. H. LlLl. 3,190,395

VEHICLE SUPPORTING RACK Filed Aug. 18, 1961 8 Sheets-Sheet 5 :All 196 -E 175 |97 INVENTOR MELVIN H. LILL ATTORNEY June 22, 1965 M. H. LILL 3,190,395

VEHICLE SUPPORTING RACK FiledAug; 18. 1961 8 Shana-Sheet 6 365 ZO lI-'IIIEI' l 1 E .,301 29,9

:sa 27o 164 'L-v--LL-n-" 14a 21s l r 1 V l o f) 292// 28e, 299 sos 28 L23'? 2'25 287%), 27e lNvEN-ron MELVIN H. LlLL BY MM ATTORNEY June 22, 1965 M. H. LILI. 3,190,395

VEHICLE SUPORTING' RACK Filed Aug. 18. 1961 8 Sheets-Sheet '7 n I J 290 /27' 92883 237 28/ 305/ 278g, 27e ZI) 30o T' I I3 l 20 332 aan ./172 17o 32e am 17o 19g Q l) if f -f/ 32a l' W2 329 r l INVENTOR MELVIN H. LILL ATTORNEY June 22, 1965 M. H. LILI.

vmucm: surronme man 8 Sheets-Sheet 8 Filed Aug; 18. 1961 FuE- 1E l Jl I INVEN'roR MELVIN H. LILL BY Mw ATTORNEY United States Patent 3,190,395 VEHICLE SUPPURTING RACK Mea'vin H. `Lilli, Lansing, Mich., assigner to FMC Corporation, San Riosa, Callit., a corporation of Deiaware Filed Aug. 1S, 196i, Ser. No. 132,473 37 Ciaims. (Cl. 187 3.67)

' The present invention pertains to a vehicle supporting rack and more particularly to an improved mounting for elongated runways of a rack to adapt the runways for elevational movement between an inclined vehicle a-scending and descending position and a level vehicle-supporting position.

It is known to support an automobile on a rack in a generally horizontal work position for checking wheel alignment, for lubrication, for inspection and repair, and the like. Although not limited thereto, the subject rack is conveniently described in connection with its use for checking wheel alignment. In examining automobile wheels for proper alignment, as with apparatus of the type disclosed in the Carrigan Patent No. 2,601,262, granted June 24, 1952, the automobile is usually supported on a pair of elevated runways. Because of their association with the wheel alignment apparatus, these runways are conventionally mounted in a horizontal position perpendicular to a projection screen in front of the runways. The runways support the automobile so that its wheels are tangential to a common horizontal plane normal to the screen.

In the past it has been conventional to drive an automobile upwardly along inclined ramps onto runways iixed in elevated, level positions. These ramps have been relatively long to provide for gradual ascent of the automobile and, therefore, have added undesirably to the space requirements for the apparatus. While pit installations might eliminate the need for ramps, pits are not generally employed because of their excessive cost, immobility, and inconvenience, as well as their general unsuitability for wheel alignment apparatus of the type referred to above.

With alignment apparatus of the type discussed above, it is also necessary to adjust the runways transversely of each other for accommodating vehicles of various tread widths and suspension systems, and for locating the vehicles in desired alignment-checking position. Such transverse movement includes adjustment of the rear ends of the runways relative to their forward ends, as well as -movement of the runways along rectilinear paths normal to the runways. Whereas it has been known to mount runways for elevational pivotal movement between inclined and level positions, such runways have not accommodated the desired transverse adjustments.

It is significant in the present invention, therefore, that the runways are mounted on rollers; that these rollers ride on rails; that the rails extend beneath and transversely of the front and rear ends of the runways; that one of the rails is mounted for elevational movement for raising and lowering the runways between inclined and level positions; and that the rollers not only enable transverse adjustment of the runways but also accommodate their elevational movement between said positions.

Furthermore, in employing a supporting rack for checking wheel alignment, the runways must be precisely level. In the subject rack, therefore, the rails must be maintained level in order to support the runways in a similar manner. In view of this, it is also signicant in the present invention that a lift mechanism supports the elevating rail directly beneath the points of application of the load, said loading points being directly under the runways, not between the runways. Support at these points minimizes elastic deformation of the elevating rail.

3,l9h,395 Patented June 22, 1965 Cice As will be understood more fully from the following description, mounting and control mechanisms for runway safety support legs and for runway guards are also of importance in the present invention.

Accordingly, it is an object of the present invention to provide an improved vehicle supporting rack.

Another object is to provide a pair of elongated wheel runways which are movable transversely of their length and which are elevationally adjustable between an inclined ascending and descending position and a level wheel-checking position.

Another object is to provide wheel runways which accommodate vehicles of various tread widths and suspension systems and which facilitate the checking of Wheel alignment.

Another object is to provide runways which are mounted for limited free play longitudinally thereof when level but whereby such free play is precluded when the runways are inclined.

Another object is to provide an economical and portable vehicle supporting rackwhich occupies a minimum of space and which does not require a pit installation.

Another object is to provide safety devices for wheel runways which preclude inadvertent lowering of the runways as Well as inadvertent rolling of a vehicle ott the runways.

Another object is to provide a runway safety support leg and a latch therefor wherein the leg is automatically unlatched when the runway is lowered whereby such leg is conditioned to drop into a runway supporting position when the runway is subsequently elevated.

Another object is to provide a guard control mechanism which automatically raises a guard to a guarding position when the runway is elevated, which does not retract the guard when the runway is lowered or interfere with the lowering of the runway, and which is operable to retract the guard only by manual or mechanical actuation independently of the elevational, or other movement, of the runway.

These, together with other objects and advantages, will become more fully apparent from the following description and accompanying drawings, in which:

FIG. 1 is a perspective of a wheel alignment apparatus including an adjustable vehicle supporting rack embodying the principles of the present invention.

FIG. 2 is an enlarged plan of the vehicle supporting rack illustrated in FIG. l.

FIG. 3 is a side elevation of the vehicle supporting rack in a level position with a vehicle supported thereon.

FIG. 4 is an enlarged side elevation of the subject rack in an inclined position wth intermediate portions thereof being broken away and with the runway guard in a retracted position.

FIG. 5 is a fragmentary, enlarged transverse section taken on line 5 5 in FIG. 2 with portions of a wheel stop being broken away.

FIG. 6 is a still further enlarged, fragmentary transverse section taken on line 6 6 in FIG. 5 with an alternate position of a clamp mechanism illustrated therein being shown in dashed lines.

FIG. 6A is a side elevation of the clamp mechanism of FIG. 6 but with the clamp handle rotated ninety degrees from it-s position in FIG. 6.

FIG. 7 is an enlarged, fragmentary isometric of a lift mechanism employed in the rack of the subject invention.

FIG. 8 is a fragmentary, enlarged vertical section taken on line 8 8 in FIG. 7.

FIG. 9 is an enlarged transverse section taken on line 9 9 in FIG. 2.

FIG. 10 is an enlarged, fragmentary section taken on line 10 I0 in FIG. 5.

FIG. 11 is an enlarged, fragmentary plan of a rear portion of a runway of the subject rack with a portion of the runway being broken away and with the runway guard in a raised position. Y Y

FIG. 12 -isV a fragmentary, side elevation of therunway as shown in FIG. 1ll but with portionsbroken away and FIG. 16 is a schematic of an electro-pneumatic circuit A employed with the rack of the present invention. Y A

TheI vehicle supporting rack of the present invention `comprises a pair of elongated runways 20 (FIG. l) each'. of which is supported at its forwardvend on a pedestal:

25. Each pedestal provides spaced,- upstanding, triangular inner and outer brackets 26 (FIG. 5 each bracket having bottom edges 27 bolted, orV otherwise secured, to a floor 28, and (FIG. 15). j Y Y Each pedestal 2S also includes a cylindrical front support rail 35 (FIG. 1) connected to the apices 29 ofthe having an upper apex 29 brackets 26, the two rails being in axial alignment with Y ,each other. Each rail vhas an upper convex surface v6 (FIGS. 5 and 6) concentric with its longitudinal. axis, anY

inner end 37, and an outer end 38.V Stop blocks 39 iare secured to thereunder side of each rail 35 between the brackets 26. A tool tray'40 rigidly interconnects'the two brackets 26 of each pedestal invdownwardly spaced relation to the corresponding support rail 35.

The rearward ends of the runways 20 are'suppor'tedl ,on ,al reartransverse Ybase; (FIGS. v-1 and 2) that is disposed in rearwardly spaced relationV tothe pedestals 25. f The baseprovides two spaced, .substantially parallel, ,longitudinal base portions 46 (FIG. 1) interconnected by a transverse base portion 47. Each of the base portion 46 preferably has a box section and has a rear 1ongitudinal slot 48. The transverse'base portion 47 is chan- Y nel-shaped and has a plurality of upper notches 49 (FIG. 7) in one upstanding arm. 7 n l Pairs of spaced ears (FIG. 7) are rigidly connected to, and project upwardly from, forwardV ends of each of the longitudinalA base portions 46. Elongated'lift arms 56 have front ends 57 individually pivotally connected be- 4 arms, and each ram includes a cylinder V76 (FIG. 8) having a lower end mounted on the transverse base portion 47 and an upper end wall 79 providingan axial bore 80. Tubular piston rods 82 are slidably tted in the bores of the cylindersand provide open, internally threaded upper ends'84. Externally threaded plugs 85 are threaded linto the upper ends of the piston rods for adjusting the strokes of the piston rods. Hex-shaped stems 86 are outwardly extended from' the plugs in axial alignment with the cylinders. VHoses 88 (FIG. 16) are individually connected to the cylinders andare interconnected by a .union 89. Preferably, a, three-way double solenoid valve 90 interconnects the lunion and a source .of fluid-pressure, such as an air compressor 91V. The. valve is adapted to Vholdl its position after the momentary energization of either solenoid 92. A main control valve 93 is also, connected to thesource.

A lower collar 95 (FIG. 8) circumscribes each stern 86, said collar having a lower liatv face 96 secured to the Vplug 85,l and an upper spherically concave'face 97. An

upper collar 99, which loosely circumscribes the steni 86, is disposed'above each lower collar 95. Each upper collar 99 has a flat-face 100, and alower spherically con-r 1 posed over the cylinders 76 and include upper cross pieces 107 which have cylindrical ,apertures 168` individually fitted over the stems 86. VAs seen in FIG. 8, these apertures are diametrically largerr'than the stems to allow limited movement of the cross pieces transversely of the stems. The cross-pieces are secured to the upper faces of their respective collars'99. Washers 110 circumscribetthe stems above Vthe cross pieces, and retaining rings 111 are secured to the stems above thewashers. The yokes 'also include spaced parallel, inner and outer legs`112 and 113. Thelegsa're rigidly connected to their respective cross pieces on. opposite'sides of the rams 75 and are downwardly extended alongside their associated cylinders 76. Pins 115 are connectedfto lower ends of the legs and are outwardly extended therefrom in rearwardly spaced, substantially parallel relation to the lift bar 69. A pairrof links 116 is associated with each ram .and vhas rear ends individually `pivotally attached to the pins 115 -and front endsI rigidly connected to the lift bar.

tween the pairs of ears byppins 58, and kalso have oplposite rear ends 59. The lift 'armsarethus mounted in substantially parallel relation to each other and intransversely'spaced relation for elevational pivotal movement about a common axis extended transversely of the rack.- l-

outer end portions 66 rigidly connected to the rear ends 59 of the lift arms 56.l .'Ihe rear'rail is thereby positioned Vin rearwardly spaced, substantially parallel relation vto the front support rails 35.` A stop block 67 is connected support rail 65 also has an'upper convex surface 68 con- `centric tothe longitudinal axis of the rail.v An elongated ltubularl lift bary 69,` which is substantially parallel to rail A65, rigidly interconnects the lift arms, beingrconnected to said'arms at points intermediate the ends 57Y`and 59 so'that the` bar is in forwardly spaced, substantially parallel relation to the rear support rail. The lift bar 69 helps tokeep the rear rail 65 in a horizontal position, parallel to therpivot pins 58. Y- Y 'Iwo` rams 75V (FIG. 7). arer-us`edlto actuate the -lift The lift arms are pivotal about said axis between upper 'A Y Y distortion or elastic deformation.

4rear rail isgmaintained in a precisely level position, co-

, The liftarms 56 are, therefore, adjustable in a vertical direction'as a result of upward expansionand downward retraction of the piston rodsVV 82 in their cylinders-76. The loose t `of the cross pieces 107 on vthe stems 86 and 4the slidable movement of the upper collars 99 on the lower collars'95 accommodate pivotalmovement ofthe lift arms notwithstanding vertical rectilinear movement of the piston rods.' It is alsosignilicant that the lift bar 69 absorbs distortion caused vby the lifting effort ofthe rams 75,and that the rear Vsupport rail 65 is -freed of such In this manner the planar with the front "rails 35.V Plates 11S interconnect the rear* rail 65 and the lift arms adjacent the point where the arms are; secured to the; rear rail.. Adjustable rstop bolts 119 arefthreaded through the plates 118 and have `lower ends engageable with, the longitudinal base portions ,tothe' undersideof each end portionv'of the rearrail Vin outwardly spaced relation to the lifty arms.v The rear l46 in the `lower positions of the lift arms.

Anelongated shaft (FIG. 7) extends through the Vtubular lift bar 69k coaxially therewith fandprovides. op-v posite ends 126.that are freely rotatably received in the lift Varms 56 andprojectvoutwardly therefrom.v Safety support'legs 127 have inner ends 128 rigidly connected ,toV the outer'ends of the shaft 125. Thetwo legs 127 are radially 'extended from the shaft'in a common radial planeand are gravitationally...swingable relative to the lift arms lfrom a retracted position K13-IG. 7), extended alongside of the lift Varms when vthe arms are in-their lower position, to.a runway-supporting position (FIG. 3)

'rear end portions extended over the rear rail 65.

angularly downwardly extended from the lift arms when the lift arms are in their upper position, the outer ends 129 of the support legs 127 being adapted to rest on the bases i6 in said latter position.

An L-shaped latch 135 (FlGS. 3, 4 `and 7) is pivotally connected by a pin 136 to one of the lift arms 56 for pivotal movement about an axis parallel to the shaft 125. With the associated safety leg 127 in the retracted position of FIG. 7, the pin 135 is disposed adjacent the outer abutment end 129 of the leg. The latch has a latching arm 137 including a finger 138 adapted to hook over the abutting end of the leg in its retracted position, and a releasing arm 139 perpendicular to the latching arm. The latch is pivotal between a latching position (FIG. 3), wherein the nger is disposed in latching engagement with the leg, and an unlatched position (FIGS. 4 and 7) wherein the linger is spaced forwardly of'the abutting end of the leg. A torsion spring 141 which has one end 141:1 engaging the upper surface of arm 56, is mounted on the pin 136 and is connected to the latch for yieldably urging the latch into its latching position. An unlatching stud 143 is rigidly secured to the base portion i6 and projects upwardly therefrom adjacent to the latch and is engageable with the releasing arm 139 when the associated lift arm is lowered. Accordingly, the latch is automatically moved to its unlatching position when the arm 56 moves downwardly toward the base 46.

Each of the runways 2l) of the rack has a front mounting end portion 1157 (FIGS. l and 2) and a rear vertically movable end portion 148. The runways are positioned over the transverse rails and 65 with the front end portions extended over the front rails 35 and with the The runways are in transversely spaced relation to each other and each runway is located above one of the lift arms 56. Each runway includes a lower, upright channel member 149 (FIG. 5) extended longitudinally of the runway. An

' upper wheel plate 151 overlays and is secured to the channel member; the wheel plate provides an upwardly extended inner flange 152 and a downwardly turned outer flange 153. A U-shaped saddle 155 (FIG. 3) is welded to and extends forwardly from the wheel plate 151 and has spaced front and rear flanges extended transversely of the channel member. A step plate 157 is welded to the front flange of the saddle 155 and projects forwardly therefrom and transversely outwardly from the channel member as seen in FIG. 2. Each step plate includes a pair of upwardly opening sockets, not shown, into which the legs of a Uehaped wheel stop 16) is releasably fitted. Turntables 161 are received in the saddles and are mounted on the runways for rotation, in any well-known manner to permit pivoting of the wheels during the wheel aligning operation. The wheel plates have rear, substantially rectangular openings 163 (FIG, l), and an abutment member 154 is secured to each plate forwardly of kthe opening 163.

A pair of front roller mounting brackets 17 El (FIGS. 4, 5, 6 and l5) of angulated cross-section are rigidly secured under and to the channel member 149 of each runway 2li. The brackets are extended transversely of the runways, but the brackets on each runway are spaced from each other longitudinally of their respective runway. As seen in FIG. 5, the front brackets have inner ends 171 spaced inwardly from the inner flange 152 of the associated runway. Stop flanges 172 (FIG. l5) are sekcured to the inner ends of the front brackets. The brackets provide outer ends 17d- (FIG. 5) terminating inwardly of the outer flange 153 `of the runway. Also, each of the two front brackets of each runway has an inner and an outer hole 175 and 176, the inner holes 175 being in alignment with each other longitudinally of their runway as seen in FIG. 6, and the outer holes 176 also being in alignment longitudinally of their runway.

Referring to FIG. 2, it will be noted that four pairs of rbrackets 179 and 18d are provided at the rearward ends of the runways 29, one pair of brackets being mounted on the inner side of each runway and 4another pair 0n the outer side of each runway. Further, the four brackets i179 lare in substantial .alignment transversely of the runways, as are the brackets 13u. Also, it should be noted that each runway has an inner rear roller 181 and an outer roller 182 mounted individually in pairs of the brackets 179 and 18d. In addition, at its forward end each runway has an inner roller 183 and an outer roller 184. As will be Iexplained presently, the inner rear rollers 151 have one type of mounting, the inner front rollers 183 have another type of mounting, and the four outer rollers 132 and 184 have :a third type of mounting.

The mounting of the inner rear rollers 181 is particularly shown in FIG. 9 wherein it will be seen that a shaft is disposed in aligned openings 136 and 187 in the mounting brackets 179 and 180, respectively, the brackets being welded to the underside of the runway wheel plate 151 and to the .side .surface of the runway channel 149. The shaft 185 includes .an intermediate cylindrical portion 135e and threaded end portions 18517, the ends 185i; being diametrically smaller than, and endwardly eccentrically extended from, their intermediate portion 18551. Each of said end portions projects through one of the aligned holes 135 .and 187 of the brackets, the holes 136 and 157 being slightly larger in diameter than the cylindrical por- -tion 185g of the shaft. Collars 189 concentrically circumscribe the end portions of the shaft and are received in the holes of the roller brackets. These collars are of `a thickness slightly less than that of the vroller brackets within which they are received. Washers are tted over the end portions of the shaft and positioned against :the brackets, and nuts 191 are threaded on said end portions for tightening against the washers. In this manner the rear, inner roller brackets are clamped tightly between the intermediate portion of the shaft and the washers to preclude rotation of the shaft. It is `also to be noted that the collars mount the intermediate portion of the shaft eccentrically of the holes 156 and 1537. When the nuts are loosened, the shaft may be rotated so as to move the surface of the intermediate portion of the shaft toward and away from its respective runway. Referring to FIG. 2, it will ybe evident that each runway is supported on four rollers, one of which is an eccen-tr-ically mounted roller 131. yIf the runway is not resting solidly on all four rollers, the eccentric shaft of roller 181 is rota-ted until the solid engagement of all four rollers is attained. Thus, the eccentric roller provides means for eliminating a possible unstable engagement of 4the runway on the rollers. When the desired adjustment of the eccentric roller 181 is completed, the nuts 191 are tightened to lock the eccentric shaft.

The mounting of the front inner rollers 133 is shown in FIG. l0, A shaft 195, which has opposite ends 1% )and 197, extends through the aligned holes 175 of the corresponding front `angle brackets 176. The rear end of shaft 195 has a transverse keyway 193 opening radially outwardly `of the shaft. A key 199 is bolted to the adjacent bracket 176 and is extended into the keyway so as to preclude both axial and rota-tional movement of the shaft 195 relative to its bracket.

The front inner roller 183 (FIG. l0) has opposite ends 215, an outer concave or hyperboloidal surface 215 of revolution concentrically circumscribing an axis for the roller and rollably engaging the adjacent front rail 35, an inner cylindrical surface 217 concentric to said axis and circumscribing a bore 218 receiving the shaft 195 therein, and `annular end grooves 219 radially outwardly extended in the linternal surface `adjacent to the opposite ends of the roller. The surface of revolution of the roller has a radius of curvature which is slightly greater than the radius of curvature of the convex surface 36 of its support rail 35 so that the roller is .substantially complementary to, and self-centering on, said rail.

An outer tubular twopiece race 225, preferably a thinwalled, hard steel sleeve, isV pressaitin the bore 218.Y Inner washers-226 .are itted against opposite endsof thev spaced relation to the race 225. The cage has `opposite ends'230 adjacent to the opposite ends 215 ofthe roller. The ends of Ithe cage have annular grooves 231 therein, and a .plurality of circumferentially spaced, radially out'- wardly divergent, frusto-conical ball-receiving pockets V232 are formed in the cage. 4Outer retaining ringsy 233 are Ifitted in the grooves 231 in the'opposite ends of the cage in opposed Vrelation to the inner washers 226 at their respective ends of the roller. Spherical balls 235 are individually iitted in the pockets 23-2 for roll'able contact with 'the race 225 and with the shaft 195. A Referring again to FIG. 9, it is to be understood that Aeachrear inner roller 181 isrotatably' mounted on the same .type of ball .bearing assembly as described in connection with the front inner rollers 183.

The rol-1ers 181 and 183 are mounted, therefore, on their respect-ive kshafts 185 and 195 for rotation about ltheir shaft axes and for movement axially of their asso-V ciated shafts, Such axial movement, however, is limited by engagementY of the opposed inner washers 226 and outer retainingrings 2313. It is to be noted rthat :the brackets 170 .are spaced from the opposed ends 215 of their reways are precluded from such movement. The strrups 246, the straps 24tand 250, and the handles 252 constitute clamps, generally indicated by thenumeral 260. It is to be noted that the stirrups 246 (one only being shown in FIG. associated with the front outer rollers are located between they stopblocks 3 9 and the outer triangular bracket 26 so thatr transverse movement of the runways on the railsis limited. Similarly, the stirrups associated with the rearzouter rollers 182 are disposed between the lift arm 56 and the adiacentstop :block 67.

.Asis now evident, the front rollers 183 and 184 of each runway rest in rolling engagement on the subjacent front` support railsj35. The rear rollers 181 and 182 f are likewise supported ontherear support rai-l 65. The

spective rollers -byfamounts suiiieient 1to accommodate f such :axial movement of the rollers on" the shafts.

The mounting of the two outer rear rollers 182 and the two outerY front rollers 184 is illustrated in FIG. `6 wherein one of the front rollers`184 is shown. Each front rollerr184 is mounted on .a shaft235h having end v Yand 184 are mounted for rotation and limited axial movement in bearing .assemblies in'exactly the same manner vas shown in FIG. l0 in connection with roller 183. The mounting of the outer rollersf182 and 184k differs fromthe mounting of the other rollers ink that a `clamping mechanism is provided on the end ofthe shafts on which the rollers 182 v and 184 are journalled-V so thatv these rollers can be locked on their respective rails and '6-5 at certain stages in the wheelaligning oper-ation.

Each clamping 'mechanism includes a rigid' strap 240 (FIG. 6) that is bolted to one of the rbrackets 170 4and has an vupper end 240a disposed Ain a transverse keyway 241 provided in one endV of shaft 235. A U-shapedstirrup 246 underlies the rail 35 and has one eind 246a v adjustably secured to the lower end of the strap 24.0 by a bolt 247 which extends through a slot 248 (FIG. 5) in the bar 24) and through a hole in the stiriupv end 246:1. The other end 24612 (FIG. 6) of the stirrupVr is adjustably secured to the lower. end of a second rigid strap-250 by means of a bolt 251 which extends through Ian vappro-A priate slot in strap 250 and a hole in the stirrup end 2461;. The upper end of strap 250'is, provided with'a cylindrical opening 250a.which receives the hub 251 of ra ,handle 252. 6A) whichreceives the .end of shaft 235, a Yretainer ring 254 (FIG. 6) being disposedv in a groove 255 shaft" 235 to retain the handle on the shaft235'. y Y

It Vwill be evident that when the handle 252`is1swung fromthe full line position-'to the .phantom fline position ,in FIG. 6A, the strap 258 will be moved upwardly'caus-Y A ing the stirrup 246 to engage therail35, thereby` clamping ,the roller 184V to the rail 35. It isthus evident that when whereas with the handles'in clamping positions, the run- The hub 251 has an eccentric opening 251a (FIG.

' are loweredto inclined positions.

runways are thus mounted for movement transversely of each other along the support rails. Also, the runways are mounted forsimultaneous elevational movement between level positions (FIG. 3) when the lift` rams 75 are expanded, and inclined positions (FIG. 4) whenl the rams are contracted. In the inclined positions, the rear end portions 148 of the runways are at a lower elevation than the front Yend portions 147. `Thev runways Vare thus raised and lowered incident to the raising and lowering of the rear Vrail 65. It is significant that the rollers accommodate elevational movementof the rear rail inasmuch as the concave 'surfaces of the rollers yslide circumferentially on the convex surfaces 36 and 68 of their respective rails during said elevational movement of the rear rail. Y

It is also to beV noted that strike plates 237 preferably are mounted on the'fioor 28 below the rear end portions `143. The rear end portionsgengage thestrike plates in the inclined positions of the' runways.v In addition, because of the'limited axial movement of the rollers'181, 182; 183and 184 on theiry respective shafts 185,236,195 and 235 when the runways 20 are in elevated level positions, the vfront and rear end portions v147 and 148 of the runways yare transversely adjustable relative to each other. This adjustment is limited by the allowable freel play of the rollers.l Further, said axial free play is precluded or taken up Whenjthe runways Such take-up of the free play occurs because the front and rear 4rollers are respectively moved toward and away from each other upon raising and loweringof the rear rail.' This is il'lustrated in FIGS.' 3 and 4.. There is relative movement between the front and rear rollers on each runway because the rear rail 68 moves invan arc aboutthe lift arm pivot pins .58, yThis Yarc is diiferentfrom the arc `of movement of the rear rollers which swing on anv arc that has the rail 35 as center. For'example, when the `runways are lowered, vthe rear rail 68^is moved downwardly and rearwardly relative to the front rails 35 whereby the rear rollers lare slid axially toward the lower ends of their shafts. At the same time, the front-'rollers are slid axially on their shafts.` When the runways are raised, the front jand rear rollers are moved toward each other so that wardly inclined position of FIG. 13 to prevent the automobile from rolling off the runways 20. For mounting the guards, guard hinges 271 are individually rigidly lbolted to the wheel plates 151 in forwardly adjacent rela- ,tionto -theopenings 163. Each guard is pivotally connected to a hinge 271 for elevational movement .about a pivot pin 272 extended transversely of the runways. Each guard is thus movable between a lowered `position (FIG. 14), Vwherein/it is` disposed inthe opening 163,

to the upwardly extended `position of FIG. 12. A pair of Vspacedwebs 27.3 are welded to and extend downwardly :from each Iguard through the adjacent opening. VAn identical Aover-center, toggle linkage 275 is provided in` each runwayY 20. Each linkage includes a pair ytoggle arms.

9 of transversely spaced pivot brackets 276 (FIG. 1l) mounted on the central portion of the channel member 149 at a point below and, forwardly of the guard hinges 271. An L-shaped guard-retracting crank 277 includes an axle 278, constituting a rst axis of the toggle linkage, rotatably journaled in the pivot brackets. It is noted that the axle is extended transversely of the runway and is parallel to the guard pivot pin 272. The retracting crank also has a handle 279 perpendicularly extended from the axle externally of the channel member.

Each toggle linkage 275 also includes a triangular link 234 having a lower front apex 235 rigidly secured to the axle 278 between the pivot brackets 276, a lower rear tubular apex 256, an upper apex 287, and a lateral shoulder 238 intermediate the upper and lower front apices. A guard pin 290, constituting a second toggle axis, is extended between and mounted on the Webs 273 in downwardly and rearwardly spaced relation to the guard pivot pin 272. A toggle pin 291, constituting a third toggle axis, is journaled in the lower tubular apex 236 of the triangular link and is also parallel to the guard pivot pin 272 although located between the crank axle 278 and the guard pin 290. Toggle arms 292 pivotally interconnected corresponding opposite ends of the guard pin 29111 and toggle pin 291, and a tubular spacer 293 (FIG. 11) circumscribes the guard pin between the The triangular link is pivotal with the crank axle between a guard locking position (FIGS. 12 and 13) wherein the guard 270 is pivoted into its guarding position and wherein said third axis, or toggle pin 291, is located below the common plane of the rst axis, or crank axle 27S, and the second axis, or guard pin 296, and an unlocking position (FIG. 14) with the guard released for movement into its retracted position and with the said third axis located above the said common plane of said irst and second axes. The retracting crank is capable of moving the triangular link between its locking and unlocking positions but is primarily employed to move the link into unlocking position, as will be subsequently evident.

A mounting sleeve 293 (FIG. 11) is supported on the channel member 149 of each runway 2t). A guard raising lever 2G29 includes an arm 303i and a horizontal shaft 3h@ journaled in the sleeve 298. The arm 301 of lever 229 projects radially downwardly from the shaft 3th) while the horizontal shaft portion 36) is keyed to an upper arm 362 that projects radially upwardly into the channel member in an obtuse angular relation with the arm 301. A slide member, in the form of a capscrew 393, has one end threaded into a tapped hole in the arm 302 in upwardly spaced, parallel relation to the shaft 300. A cylindrical counterweight 365 is journaled on the arm 3491 for rotation about an axis in downwardly spaced, parallel relation to the shaft Shi). fEach toggle linkage 275 also includes an elongated actuating lever 311i which has a rear end 311 pivotally connected to the upper apex 237 of the corresponding triangular link 234 by an upper pin 312. The upper pin is parallel to the guard axis and constitutes a fourth axis of the toggle linkage. The lever has a lower edge 313 engageable with the shoulder 288 of the link 2h42-, The lever extends forwardly within the channel member 149 and provides an elongated, longitudinally extended 'slot 315 terminating in a rear edge 316. The capscrew slide member 303 is slidably received in the slot of lever 310, and the head of the member 303 limits movement o1' the arm transversely away from the lever but permits said longitudinal slidable movement of the member within the slot.

When each link 284 is in its guard-locking position (FIGS. 12 and 13), the lower edge 313 of the lever 31) abuts the corresponding shoulder 288 thereby to limit counterclockwise rotation of the link, as viewed in FIG.

13. The guard 270 is precluded from retracting when the link is in its guard locking position since downward pressure on the guard is ineffective to rotate the link in a counterclockwise direction; that is, such counterclockwise rotation is precluded by abutment of the shoulder 233 with the lever 310. In addition, downward pressure on the guard is ineffective to rotate the link in a clockwise direction because said third axis 291 of the linkage is below the plane of said rst and second axes 278 and 290.

The described linkage 275 and the lever 299 provide a unique coaction between each runway 2i) and its guard 270. When the runway is elevated from an inclined position, the linkage and the lever 299 automatically raise the guard. When the runway is lowered into inclined position, the guard remains in raised position; the linkage and the bell crank do not thereby automatically retract the guard.

More specifically, the coaction between each runway 20 and its guard 270 is best understood by reference to FIG. 14 where the runway is illustrated in an inclined position and the guard is illustrated in a retracted position. If the runway is elevated, the counterweight 365, acting through lever 299, causes the slide member 393 to bear against the rear edge 316, urging the lever 3119 rearwardly or to the left in FIG. 14. This movement of lever 31) pivots the triangular link 284 in a counterclockwise direction about axle 27 8 and shoves rearwardly on the toggle links 292. Further, the toggle links pivot the guard 27h in a clockwise direction about pivot pin 272. When the runway is in its level position (FIG. 12), the toggle linkage 275 and the lever 299 have moved the guard into its fully raised position.

When the runway 2t) is lowered from its level position (FlG. 12) into an inclined position, as illustrated in FlG. 13, the weight 3%' moves into contact with the floor 28. The arm .3@2 is pivoted in a clockwise direction to move the slide member 393 forwardly in the slot 315. Thus, each triangular link is not pivotcd in a clockwise direction when its runway is lowered; instead, said triangular link is merely conditioned for such clockwise movement by subsequent rotation of its axle 278 when the handle 279 is turned. The slot 315 in the lever 316 is longer than the stroke of the slide 3133 so that the slide cannot slip out of the slot even if the counterweight 31955 moves into engagement with the associated runway.

The handles 279 are turned either manually or by guard retracting rams 319 (FIGS. l1 and 16). These rams include cylinders 326 (FIG. 11) individually mounted rearwardly of the handles on the runways 2%. The cylinders are provided with bleeding ports (FIG. 16) of predetermined size, and piston rods 322 are reciprocally mounted in the cylinders in substantially normal relation to their respective handles 279. Hoses 323 are connected to the cylinders and have opposite ends connected to a control 4valve 321i which, in turn, is connected to the source 91 of fluid pressure through the main valve 93. Air is continuously delivered to the cylinders 326 at a predetermined slow rate and is bled from the ports in order to prevent accumulation of moisture in the cylinders 32d but without actuating the piston rods 322. It it is desired to actu-.ate the guard retracting rams to rotate their Arespective handles, air is fed to the cylinders 32@ at a rate more rapidly than air is exhausted from the ports so that the rods are extended. This is accomplished by energizing a solenoid 325' connected to the guard control valve. When the air pressure is relieved, the ports bleed the air from the cylinders and allow the rods to retract.

With reference to FIGS. 13 and 14, if the guard 27) is in a raised position, it is retracted Iby -rotating the handle 277 in a clockwise direction. If the handle is rotated mechanically, the solenoid 325 need only be energized momentarily. Such momentary energization extends the piston rods 322 and effects the desired rotation of the handles. Furthermore, the handles remain in the positions illustrated in FIG. 14 and the guard remains in a retracted position. This is true even though ll the solenoid325 is deenergized and the piston rods 322 are retracted. e' On the other hand, if sulicient force, either manual or mechanical, is applied to the handles to turn the sai'newhenV the runways are in level position (FIG. 12), thereby'retracting the guards, the guards areY Vautomaticallyl returned to raised positionsv as soon as such pressure is relievedy from the handles. rl`his is believed understood since the levers 299 and associated weights 305 constantly urge the guardsto raised ,positions when the runways are elevated in their level positions.Y e

Jack-supporting stands 326 are individually mounted on the inner ends 171 of the front anglel brackets'170' (FIGS. 1,2 and l). Each stand includes a plate 327 (FIG. l5) which spans the two brackets and a retainer member 32S that is secured tothe plate and has a lip 323e' in Vdownwardly spaced relation to the plate. The lip is extended under thejrearwardmost bracket 17 0 for limiting upward movement of the plate. Each stand also hasV a front cleat 329 forwardly adjacent to the forwardmostV front bracket, a central rib'330 downwardly vextended from the plate in a plane substantially bisecting the front support rails 35, and rear and front flanges 331 and 332 upwardly extended from the plate. Each stand `is thus fitted on its brackets for adjustment thereon transversely of its respective runway 2G. The stand isremoved from` the brackets by pivoting the plate327 upwardlyY relative to the rearwardmostv front bracket 170 and then sliding theplates rearwardly to remove the retaining lipv 32Sa from underneaththe;rearwardrnost front bracket 170.

Lifting jacks 34@ (FIG. l) are individually'mounted on the stands 326 for imparting lifting'force to a vehicle, as 345 (FIG. 3), supportedon they runways 20. The flanges v331 and 332 of the stands prevent the jacks from sliding rearwardly off from the stands when runways Vare lowered. If an 'extra heavy vehicle is raised with the jacks, the jack stands may deflect but only until their respective ribs 33t) engage the front support rails 35 therebeneath. Also, if the jacks are located forwardly on theV stands during lifting of a vehicle, the plates are precludedfrom tipping forwardly olf fromy the brackets by engagement lbrackets.

A switch box`375 a manner not shown, at a positionrabovey the vehicle 345 vand is suspended adjacent to the drivers window of the vehicle. The switch box contains switches 376 for controlling the'solenoids 92 and 325 associatedV with the/'lifty rams 75 and the guard rams 319, respectively.

In brieliy Vsummarizing 'its use, the rack of the Subject invention is conveniently employed in association with wheel alignment apparatus (FIG. l) including an upstanding'screen 35i) supported on the floor 2S forwardly of the rack an-d a pair of optical'units 351 mountedV on the door in laterally outwardly adjacent relation to identified Carrigan Patentl No. 2,601,262. j

(FIGS. 3 and 16) is supported, in j "55 the front end portions 147 .of the runways 20. Such alignment apparatus is more fully described in the above j siga-'39s.

. YWith the vehicle 345 on the runways 20,'the lift rams 75 are expanded. Expansion of the rams raises the runways to level positions perpendicular to the screen 35i) (FIVGS. land 3). yElevationof the runways causes the lower arm Y,3M-,of levers 299to-pivotV downwardly, that is ina counterclockwise vdirection as viewed in FIG. 14, so that the guards 270 are raised into their guarding positions through the toggle linkages 275. Also, the safety legs 127 simultaneously swing downwardly by gravity, during elevation of the runways, so that their base abutment ends 129 rest on, orare closely upwardly adjacent to, the longitudinal base portions 46 when the runways are insaid level positions.vv In this manner the legs preclude inadvertent descent ofthe runwaysjif there is failure of the rams; The latch 135 is moved into its latching position byithe spring 141 as soon as the releasing arm 139 movesv out of engagementwith the stud 143. Whereaslongitudinal free `play of the runways relative to the rails 35 and 65 is precluded in the inclined positions ofthe runways, thereby to steady the runways as a vehicle is driven thereon, the runways are automatically freedY for limited free play when the runways are ment apparatus, the latter being determined by the iioor 4the longitudinal Ycenter line of the vehicle into coincident relation withithe longitudinal center line of the alignpositions of the pedestals 25 .or by the 'screen but not by the longitudinal center line 'of the runways 20'. Therefore, the vehicle is manually-pushed to the left or to the right, as.V required, this movement being easily accomplished'. because the runways are mountedfor simultaneous movement in the samejdirection` on the support f rails and 65 bythe rollers 181-184. It is to be noted that 'even if the rear supportV rail is not precisely parallel to the front Vrz-tils,uthe rollers shift axiallyv on their respective shafts,185,195,235` and 236 Yto accommodate any of the Vlips 328:1 with their respective,

Before a vehicle 345 is drivenonto the subjectrack,

it is assumed that the runways 20 are in their inclinedv positions (FIG. 4), that the guards 270 are in their retracted Vpositions (FIGS. 4 and 14'), and that the safety legs 127 are conditioned for movementV into supporting positions, it being noted inFIG. 4 that the stud 143 holds the latch 135 in an unlatched position.

The clamps 260 are released soY that the runways 20 can be adjusted laterally on the support rails V35- and 65.

4The rear inner roller shafts '185 are rotated, if necessary,

so that all of the rollers 181, 182, 183 and 184'ar`e all `in load-bearing engagement with ,theirrails `The runvehicle Vis driven upwardly onto the runwaysuntil the f front Wheels rest on the turntables 161.

' a few vertical bouncesV of the rear end portion of the vehicle. onv the runways areY sufficient to allow the rear wheels to assume such normal positions. Of course, because of the free play of the rollers 181- 84 relative to the runways, the rear end portions 148 of the runways are permitted to Y'shift laterallyrelative to :their front end portions147 thereby to permit limited adjustment of the .rear/wheels of the vehicle "into said normal positions.

After the vehicle has been Vproperly rpositioned in such manner, the runways are locked against transverse and longitudinal movement by locking .the clamps 260.

-After lthe wheel-alignment checks have been made, or

other worklon the vehicle 345 has been. completed, the .safety legs 127 are kmanually vpivoted into engagement Ywith the `latches 135 l(dashed lines in FIG. 3) whereupon .the legs are held in retracted position. It may be neces- ,sary to elevate the lift vrams .slightly in order to move `matically retracted,g,as previously explained. In this vmanner,kv inadvertent rolling fof the vehicle from ythe runways duringlowering thereof is precluded. It is noted that free movement of the slide member 303 forwardly through their slots 315 assures unrestricted lowering of the runways. For example, any jamming of the toggle linkages 27'5 in pivoting from locked to unlocking positions does not interfere with lowering of the runways. Since positive connections are not provided between the levers 299 and their associated linkages, imposition of the weight of the vehicle on the arms Stil is avoided while the lift rams 75 retract. ln order to retract the guards, it is necessary to move the toggle linkages into unlocking position, either manually or mechanically by actuation of the guard retracting rams 319. lt is noted that the stud 143 engages the releasing arm E39 and moves the latch 135 to its unlatched position whereby the safety legs E27 are conditioned for movement into runway supporting position upon subsequent elevation of the runways. The vehicle is then backed downwardly off the runways whereby the rack is ready for subsequent use.

From the foregoing, it is evident that the subject vehicle supporting rack has many unique features. Mounting the runways Ztl for elevational movement between level and inclined positions as well as for adjustment transversely of each other shortens the overall length of the rack and obviates the need for long ramps leading upwardly onto the runways. An adjustable, shortened rack is thus provided without the expense and inconvenience of a pit installation. By mounting the rails 3S and 65 in level positions, by minimizing elastic deformation of the elevating rails 65,k and by adjusting the runways into a plane parallel to the rails, the runways can be elevated into precisely level positions. A vehicle can be located quickly and accurately in a predetermined position for making wheel alignment checks, or for performing other tasks. In contrast with racks requiring a pit, the subject rack is portable in that it is readily attached to or detached from a foundation. In addition, the rack provides for safe and dependable support of the runways in elevated position and of a vehicle thereon; in this regard the safety legs 127 and the guards 276 must be individually retracted independently of the elevational movement of the runways.

While a preferred embodiment of the present invention has been shown and described, it will be understood that various changes and modifications may be made in the details thereof without departing from the spirit and the scope of the appended claims.

Having thus described the invention what I claim as new and desire to protect by Letters Patent is:

,1. ln combination, mounting means, elongated, substantially horizontal, front and rear rails borne by said mounting means in opposed, transversely spaced, substantially parallel relation -to each other, an elongated vehicle support having opposite end portions adjacent to said rails, rollers individually rollably engaging said rails for rolling movement therealong and bei-ng connected to said support for rotation relative to said support about axes extended transversely of said rails, said rails and rollers having substantially complementarily engaging convex and concave surfaces, elevational adjustment of one of the end portions of said support relative to its opposite end portion being accommodated by the engaging convex and concave surfaces adjacent to said one end portion, and powered means for effecting said elevational adjustment.

2. In an adjustable vehicle supporting rack, a pair of :support rails having upper convex surfaces concentric to longitudinal axes for their respective rails, means supporting said rails in axially spaced substantially parallel relation to each other and in substantially horizontal positions, ,a runway extended transversely of said rails, rollers having concave surfaces of revolution concentrlcally circumscribing individual axes for the rollers and rollably engaging the convex surfaces of said rails, and means journaling said rollers on said runway for rotation about their individual axes thereby mounting said runway on said rails for movement thereon in a direction extending transversely of said runway, the supporting means that supports 'ld one of said rails including powered means for raising and lowering said one rail with respect to the other rail, said convex surface of said one rail and its engaging concave surface accommodating relative circumferential movement therebetween during said raising and lowering.

3. An adjustable rack for supporting a wheeled vehicle comp-rising front mounting means, substantially horizontal front rail means borne by said front mounting means and having upper convex portions concentric t-o a longitudinal axis for said front rail means, rear rail means having upper convex portions concentric to a longitudinal axis for said Arear rail means, means mounting said rear rail means in axially spaced, substantially parallel relation to said front rail means and for elevational movement relative to said front railmeans, a pair of elongated runways individually adapted to receive the wheels of a vehicle, said runways having opposite front and rear end portions and being extended transversely of said axes of said rail means with said front and rear end portions respectively over the axes of said front and rear rail means, and front and rear rollers individually rotatably supported on said front and rear end portions of each runway for rotation about axes disposed transversely of said axes of said rail means and having concave surfaces of revolution substantially complemerntarily rollably engaging the convex portions of said front and rear rail means.

d. ln an adjustable vehicle supporting rack, a front mounting member, a rear base, a rear mounting member supported on said base in spaced relation to said front mounting member and for elevational adjustable movement, elongated front and rear support rails individually borne yby said mounting members and having upwardly disposed convex surfaces concentric to longitudinal axes for their respective rails, the axes of said front and rear rails being in spaced, substantially parallel relation to each other, an elongated runway extended transversely over said rails, rollers journaled on said runway for rotation about axes extended transversely of the axes of said rails and having concave surfaces individually substantially complementarily receiving said convex surfaces of the rails whereby said runway is supported on said rails for lateral movement when said rollers roll along their respective rails and whereby the rollers on said rear rail accommodate elevational movement of said rear end portion of said runway relative to said front end portion thereof upon elevational .adjustment of said rear mounting member, and a lift mechanism engaging said rear mounting member for raising and lowering the rear end portion of said runway.

5. In a vehicle supporting rack, an elongated support rail mounted in a substantially horizontal position, an elongated runway extended transversely over said rail, an elongated shaft, means mounting said shaft longitudinally on said runway, a roller rotatably mounted on said shaft and in rolling engagement with said rail for movement of said runway transversely of itself along said rail, a st-irrup extended transversely under said rail, a keeper rigidly interconnecting said stirrup and said shaft mounting means on one side of said rail, a hanger on the opposite side of said rail from said keeper having a lower end connected to said stirrup and an upper aperture receiving said shaft therein, and an annular cam fitted in said aperture in rotatable circumscribing relation to said shaft, said cam having a peripheral surface eccentric to said shaft and rotatably engaging said hanger whereby rotation of said cam moves said stirrup between a runway locking position engaging said rail and clamping the same between said roller and said stirrup and a runway releasing position retracted from said clamping position.

6.. A vehicle supporting rack comprising a pair of elongated support rails, each rail having an upper convex surface concentric to its longitudinal axis, means supporting said rails axially spaced, substantially parallel relation to each other and in substantially horizontal positions, means mounting one of said rails for elevational movenaled on said shafts for rotation therearound and forv movement axially thereof, said elevationally movable rail being movable toward and away from the other rail by said supporting meansy during elevational movement thereby to slide said rollers axially on their shafts, and said shaft mounting means including stops limiting said axial movement of said rollers on said shafts. k

7. The combination of an elongated Arunway having opposite front and rear end portions, means pivotally supporting said front end portion of said runway for movement about a substantially horizontal front axis extended transversely `of said runway, a reary frail having a convex upper surface and being extended transversely under said rear end portion of the runway in spaced substantially parallel relation to said front axis, a roller having a concave surface of revolution rollably engaging the upper surface of said rail, said roller being journaled on said runway and movable longitudinally of said runway, and means mounting said 4rail for elevational movement along an arc having a radius of curvature less than lthe radius of the curvature of the arc of movement of said roller about said front .axis as said runway is raised and lowered on said rail whereby said rollertis moved longitudinally of said runway incident to said elevational Vmovement thereof.

8. In a vehicle lifting apparatus, an elongated runway having front and rear end portions, means pivotally supporting said front end portion of said runway in an elevated position for pivotal movement of said runway about a front axis disposed transversely of said runway 4and for limited free play of said runwayV longitudinally thereof, a

rear support rail having a longitudinal axis and extended transversely under said rearrend portion of said runway inV tioned between said shaft and the internal wall of said roller and mounting said roller on said shaft for rotation and axial movement relative to said shaft; and means pivotally mounting said rail for elevational adjustable movement in an arc concentric to an axis between and substantially parallel to said front axis and to said rail axis whereby Vsaid roller is moved axially of vitself upon elevational movement of said rail and until said roller engages one of said bracket members and limits said axial movement.

10. In combinatiomj an annular roller having an axial bore and an internal wall circumscribing said bore, a tubular race fitted in said bore against said wall and having opposite ends, inner stops connected to said opposite ends of the race and extended radially inwardly of said bore, an elongated shaft extended through said bore in circumferentially spaced relationV to said race, a tubular cage rotatably circumscribing said shaft within said race providing opposite ends and a plurality of pockets radially extended therethrough, outer stops connected to the opposite ends of said cage in endwardly opposed relation to said inner stops, and a plurality of spherical balls individually tted in said pockets Vand rollably engaging said shaft and said race and mounting said roller for rotational and axial movementl on said shaft, said axial movement being limited by engagement of opposed stops at opposite ends of saidrrace.

11. A vehicle supporting rack comprising a pair of rails; means supporting said rails in axially spaced substantially parallel relation to each other and in substantially horizontal positions; a runway extended transversely over said rails; frontv and rearpairs of shafts; rollers individually substantially parallel relation to said front axis and having Y -an upper convex surface concentric to the longitudinal axis of said rail, a roller having a concave surface of revolution concentric to the axis ofsaid roller and substantially complementarily rollably lrested on the convex surface of said1 rail, means rotatablymounting said roller on said runway t gagement with said stops upon elevational movement of said rail. p t Y t y 9; In a vehicle lifting apparatus, an elongatedk runway having front and rear end portions; means pivotally's'upporting said frontend portion .of said Yrunway in an elevated position for pivotal, movement of said runway about a front` axis disposed transversely of said runway and for limited free play of said runway longitudinally thereof; a

:rear supportrail extended transversely under'said rear endV `portion of said runway in substantially parallelV relation to said front axis and having an upper rconvex surface concentric to the'longitudinal'axis of said rail; bracketmembers rigidly connected to said runway and downwardly extended therefrom in longitudinally spaced relation to each other; a shaft secured in said bracket members against `concentrically mounted on saidshafts; and means individually mounting said shafts on said runway extending longitudinally of said runway, each roller being in rollable engagement with one of said rails and being disposed opposite an adjacent roller transversely `of said runway, said shafttmounting means including means for mounting one of said rollers for adjustment'to positions selectively spaced from said runway for maintaining simultaneous, complementary engagement of all of said rollers withv their respective rails.

12. A vehicle supporting rack comprising a pair of rails; means supporting said rails in axially spaced, substantially parallel'relation to each other, and in substantially horizontal positions; an elongated runway extended transversely over said rails; front and rear pairs of shafts; rollers Vmounted on said shaftkmeans individually mounting said" shafts on said runway with said shafts extended longitudinally of said runway. and with va pair of rollers rollably engaging each of said rails so that the rollers engaging each rail are opposite to each other transversely of said runway, the means mounting one of said shafts including a pair of bracket portions yrigidly secured to said runway in longitudinally spaced relation and providing a pair of longitudinally aligned holes, said one shaft including a cylindrical intermediate portion circumscribed by its roller and arpair of end portions endwardly eccentrically extended from said intermediate portion throughV said holes, collars concentrically circumscribing said end portions and fitted in ,said holes of said bracket members whereby rotation of said one shaft in said collars adjusts said axis of said intermediatel portion toward and away Y v from said runway so that all of said rollers are maintained movement relative thereto; a roller having a concave surv face of revolution concentric to the axis of said rollerand .substantially complementarily rollably rested on the convex surface of said rail, an internal wall circumscribingV said shaft, and opposite ends in adjacent spaced relation to said'bracket members, the concave surface of said roller having afradius of curvature greater than the radius of the convex surface of said rail; ball bearing means posi- Vin contact with their respective rails; and means engaging positions of axial adjustment relative to said runway.

the end portionsy of said shaft and being tightenable against saidV bracket portions for securing said one shaft in selected 13. An adjustable'rvehicle lifting apparatus compris- `ing a pair of elongated, vehicle supporting runways havfing front and' rear end portions; means mounting the y front end portions of said runways for-elevational pivotal movement of said^ runways about a substantially horizontal front piv-ot axis extended transversely of said runways and for movement of said runways transversely relative to 20. In a vehicle supporting rack, a pair of substantially parallel runways, means mounting each of said runways for pivotal movement about a substantially horizontal axis extended transversely of t-he runways between a substantially level position and an inclined position, said means also mounting each runway for transverse movement toward and away from the other runway and independently of the lother runway so that one runway can remain stationary while the other runway moves toward and away from the stationary runway, and lift means for unitarily moving said runways between said level and inclined positions and for accommodating said independent transverse movement of the runways, said mounting means and said lift means also accommodating unitary transverse movement of said runways when a vehicle is supported on said runways.

21. In a vehicle supporting rack, a pair of substantially parallel runways each having opposite, longitudinally spaced, mounting and elevating end portions, rst means supporting the mounting end portions of said runways for guided m-ovement of said mounting end portions along a first predetermined substantially horizontal rectilinear line of travel extending transversely of said runway and for elevationally adjustable movement of said runways about said rst line of travel as an axis, second means supporting the elevating end portions of said runways for guided movement of said elevating end portions along a second predetermined substantially horizontal rectilinear line of travel substantially parallel to said rst line of travel, said rst and secon-d means thereby constraining said runways to move with substantially translational movement as they move along said paths, and powered lift means for raising and lowering said -second means thereby to elevationally adjust said runways about said first line of travel.

Z2. In a rack for supporting a vehicle, said rack being mountable on a supporting surface such as a floor, front rail means, means mounting said rail mean-s in substantially h-orizontal position and in vertically spaced relation to said supporting surface, rear rail means, means mounting said rear rail means in spaced substantially parallel relation to said front rail means and for elevational movement between an upper position in a common substantially horizontal plane with said front rail means and a lower position below said upper position, a pair of generally parallel runways having front and rear end portions project-ing over said front and rear rail means respectively, and means on said front and rear end portions of each runway bearing on said rail means and constraining said runways to substantially translational movement along said rail means, said rail means and said bearing means on said rear end portion cooperating to accommodate said elevational movement.

`23. The rack of claim 22 wherein said bearing means are rollers having their axes disposed lengthwise of said runways.

24. In an adjustable vehicle supporting rack, a pair of support rails having upper convex surfaces concentric with longitudinal axes for their respective rails, means supporting said rails in axially spaced substantially parallel relation to each other and in substantially horizontal positions, a pair of runways extended transversely of and over said rails, rollers having concave surfaces of revolution concentrically circumscribing individual axes for the rollers and rollably engaging the concave surfaces of said rails, and means journaling pairs of said rollers on each runway in longitudinally spaced relation therealong for rotation about their individual axes and for limited movement of each roller lengthwise of its runway thereby mounting said runways on said rails for movement thereon in a direction extending transversely of said runways and thereby permitting skewing of each runway about an upstanding axis.

25. A vehicle supporting rack comprising a pair of elongated support rails, each rail having an upper convex surface concentric with its longitudinal axis, means supporting said rails in axially spaced, substantially parallel relation to each other and in substantially horizontal positions, means mounting one of said rails for elevational movement in a vertical arc whereby said one rail moves relative to the other rail, an elongated runway extended transversely over said support rails, a plurality of shafts, means mounting said shafts on said runway over said support rails and in substantially parallel relation to said runway, and Irollers engaging said rails and being journaled on said shafts for rotation therearound and for movement axially thereof.

26. The combination of an elongated runway having opposite front and rear end portions, means pivotally supporting said front end portion of said runway for movement about a substantially horizontal front axis extended transversely of said runway, a rear rail extended transversely under said rear end portion of the runway in spaced substantially parallel relation to said front axis, a roller rollably engaging said rail, said roller being journaled on said runway and movable longitudinally of said runway, and means mounting said rail for elevational movement along an arc having a radius of curvature less than the radius of the curvature of the arc of movement of said roller about said front axis as said runway is raised and lowered on said rail whereby saidroller is moved longitudinally of said runway incident to said elevational movement thereof.

27. A vehicle lifting apparatus comprising a pair of elongated vehicle supporting runways; means mounting said runways for elevational pivotal movement about a substantially horizontal pivot axis extended transversely of said runways; a base; a pair of lift arms individually located below and adjacent to said runways and in transversely spaced relation to each other, said lift arms being mounted on said base for elevational pivotal movement about axes substantially parallel to said pivot axis of the runways; means supporting said runways on said `lift arms; and lift means for pivoting said arms about their axes.

28. A Vehicle lifting apparatus comprising a pair of vehicle supporting runways having front and rear end portions; means mounting the front end portions of said runways for elevational pivotal movement of said runways about a substantially horizontal front pivot axis extended transversely of said runways; a base; a pair of lift arms individually located below and adjacent to said runways and in transversely spaced relation to each other, said lift arms being mounted on said base for elevational pivotal movement about axes substantially parallel to said pivot axis of the runways; means supporting the rear end of portions of said runways on said lift arms; and lift means connected to said arms for pivoting said arms about their axes;

29. An adjustable vehicle lifting apparatus comprising a pair of vehicle supporting runways having front and rear end portions; means mounting the front end portions of said runways for elevational pivotal movement of said runways about a substantially horizontal front pivot axis extended transversely of said runways and for movement of said runways transversely relative to each other; a base; a pair of lift arms individually located below and adjacent to said runways and in transversely spaced relation to each other, said lift arms being mounted on said base for elevational pivotal movement about axes substantially parallel to said pivot axis of the runways; a rigid cross member rigidly interconnecting said arms and extended transversely of and beneath the rear end portions of said runways in substantially parallel relation to said front axis; means supporting the rear end portions of said runways on said cross member for movement of said runways along said cross member; and lift means connected to said arms for pivoting said arms about their axes.

30. In combination with a support, a vehicle rack cornprising front axis means mounted on the support; a pair of lift arms having front ends pivotally mounted on said stantially coplan'ar with said runways and intransversely spaced relation 'toeach other, said lift arms having rends mounted on said 'base for elevational pivotal movement about a substantially common axis parallel to said pivot axis of the runways, and said arms'having opposite ends; f

an elongated, rigid cross memberrigidly interconnecting Asaid `opposite ends of the arms and'extended transversely beneathithe rear end portions of said runways in Ysubstan-y -tially yparallel relation to said front axis; means -supporting 'the rear end 1portions of said runways on said cross member for movement of said runwaysalong said cross member; Vand lift means mounted on said base and connected to said arms for pivoting said arms about'said common `axis ytherebyto raise and to lower said runways whereby load :and flift forces imposed Ltransversely -on kthe cross member are imposed closely adjacent tothe connections of ways.

f "1B, alongside of Vsaidvarms and 'a runway supporting position downwardly extended 'from said arms for engagement with said base; andlift'means'mounted on said ibase and connected to said lift `bar 'for pivoting Ysaid arms about said common axis thereby to `raiseand to lower .said run- 16. In a vehicle'lift rack, a'support; an elongated rail; means mounting said rail on .fsaid'fsupport' in a horizontal position and for elevational vmovement'towardand away from said support; powered Ilift'means iborne'by said support and connected to said `rail 'mounting means for 'ele- Vsaid cross member to said lift arms so as to minimize :elastic deformation of said crossmember. t

121. An .adjustable vehicle lifting apparatus comprisin a pair of vehicle-supporting runways having front and rear end portions; means mounting the front end portions runways about a substantially 'horizontal front pivotal axis extended transversely of said runways and for movement of 'said runways transversely relative to each other; a

base; a Apair of lift arms individually substantiallytcoplanarv with said runways and in transversely spaced relative toV each other, said arms having front ends mounted onsaid base for elevational 'pivotal movement'about a substantially common axis parallel to the pivot axis `of said runfof vsaid runways for elevational vpivotal movement of theY y vationally moving said rail; an elongated wheel runway extended transversely over said rail; jroller means releasably rollably engaging said rail, connected :to said runway, and mounting Tsaid runway for movement vtransversely of itself along said rail; a U-shaped'stirrup extended under saidrail on" the opposite side thereof from vsaid lroller `mean'sgandmeans supportingsaid stir'rup'on said runway.

17. In vcomibina'tion'with'a support,"aivehiclerack comprising a pair of spaced, 'axially aligned, 'horizontal front 'cylindrical rails mounted on the support; 'a Vpair of lift arms 'having front ends Ypivotally mounted on said 'support *for elevational pivotal movement o'f ,said arms in 'transversely spa-ced, parallel planes about alco'nn'non horizontal axisV in rearwardly spaced-parallel relation to said front rails; -a rear `cylindrical rail rigidlyrinterfconnevcting said arms Zin parallel relation 'to said fro'nt rails for'movement with said arms in van 4arcuate-path concentric with said `ways Vand having opposite rear ends; an elongated, rigid cross member rigidly interconnecting said rear ends of" said arms and extended transversely beneath said rear end portions of said runways inlparallel relation to said front axis; means supporting the rear ,portions of said runways :common axis 4tow-'ard and lawayt-rom` said 'front rail; a .tub-ular lift bar rigidly interconnecting said lift arms in spaced parallel relation between said rear rail .and said common axis; runways extended transversely above said on said cross member for movement of said runways along said cross member; an elongated lift bar rigidly )interconnecting said lift arms intermediate theirfrontand rear ends and being in substantially paralleltrelationl'to said common axis; a lift cram -mounted on said 'base in `juxtaposed relation vto said jlift bar having an upperend lportion movable upwardly and downwardly .relative toA said base; a yoke supported on said upper end portion of said ram having a pair of downwardlyextended legs; and links interconnecting said lift bar and said legs of the yoke for raising and 'lowering'said liftbar and said arms upon movement of the upper lend portion of said ram toward and away vfrom said base. t Y Y l5. In an adjustable vehicle lifting apparatus, a 'pair'of elongated, vehicle supporting runways having :front and rear Vend portions; means mounting vthe front end portions o'f said runways `for elevational pivotal movement ofthe runways about a substantially horizontal, front pivot axis extended transversely of lsaid runways and for movement of the runways transversely relative to eachother; a base; a pair of lift arms individually substantially coplanarwith said runways and in transversely spaced relation 'to each other, said arms having Vfront ends mounted on said base for elevational pivotal movement about a substantially common axis parallel to said axis of said runways, `'and' having opposite rear ends; a rigid cross member, rigidly interconnecting the rear ends of said arms and extended transversely beneath said rear end portions of said runways in parallel relation to saidfront axis; means sup? 1 porting said rear portions of said runways on said cross member for'movement of said runways along said cross member; an elongated tubular lift bar rigidly intercom' necting said lift arms intermediate their frontand Vrear` ends and'substantially parallel `to said common axis; an elongated shaft extended throughl said lift bar having opposite ends'rotatably received in said lift arms and foutwardly yextended therefrom; safe-ty support legs individually rigidly connected. to said ends of theishaft yand radiv ally. extended Ytherefrom in `a substantially common plane for movement with said shaft between a retracted position -mentof said 'rearraiL one 'of said mounting means on fr-ont and rear rails in laterally spaced, substantially parallel relation to `each other; pairs `of front and rearl rollers 'respectively -rollably and "releasably engaging said front 'andV rear rails Iunder Isaid runways with said rollers on Aeach rail being `in 'transversely spaced relation to eac-h Iother relative to saidrrunway; `means mounting said rollers on 'their superposed runways for limited axial movement longitudinally of said yrunways duringy elevational moveeach/r'unwayf-being adjustable `for moving the axis of its 'respective roller toward and away 'from the corresponding runway;tandalift ram borne by said support andconnected 'to said lift 'bar for elevatio'na'llyA adjustingsaid run- -ways between 'anfelevated level position and a lowered ,position downwardly declinedfrom said front rail.

18. In a vehiclersuppor'ting rack, an elongated rail having an upper `convex surface, `means mounting said Vrail in a substantially vhorizontal position, Ia runway extending transversely of 'and above saidrail, 'a roller having an axis of rotationV and a concave surface Iof revolution circumscribingsaid-axis,-and means mountingsa'id roller yon said runway with its 'axis'longitudinally of the-'runway and wit-h said surface of-revolution in complementary engagement with Vsaid railwhe'reby vtherunway is 'mounted for'sub- -stantially horizontalV movement Ywitrhthe 'roller rolling on the rail :and for elevational movement with 'said roller moving circumferentially ofthe longitudinal'axis of the rail. s

lt9l Ina vehicle supporting rack, y'an elongated rail having an upper convex surface, means mounting said .railin 'a substantially horizontal position, Ja runway extending transversely of'andabove said rail, a'roller having'an axis of Vrotation and a concaveY surface Vof 'revolution' circumf scrib'ing said axis, vand'spaced brackets rotatably mounting 2l support for elevational pivotal movement on said arms in transversely spaced, parallel planes about a common horizontal axis in rearwardly spaced parallel relation to said front axismeans; a rear mounting member rigidly interconnecting said arms in substantially parallel relation to said front axis means for movement with said arms in an arcuate path concentric with said common axis toward and away from said front axis means; a tubular lift bar rigidly interconnecting said lift arms; runways pivoted on said front axis means and supported on said rear mounting member in laterally spaced, substantially parallel relation to each other; means for raising and lowering said lift bar for elevationally adjusting said runways between an elevated position and a lowered position downwardly declined from said front axis means; a shaft extended through said lift bar )and having opposite ends rotatably recieved in said arms; safety legs radially extended from said shaft in a common plane for gravitational movement from a retracted position extended along said arms when said runways are in their lower positions into runway supporting positions extended downward from said lift arm for engagement with said support when said runways are in their level position.

Sil. In a vehicle supporting rack, a rail means mounting said rail in a substantially horizontal position, a 4runway disposed transversely of said rail, a roller having an axis of rotation and a channeled surface circumscribing said axis, and means mounting said roller on said runway with its axis disposed longitudinally of the runway and with said surface in complementary engagement with said rail whereby the runway is mounted for substantially horizontal movement with the roller rolling on the rail and for elevational movement with said roller moving arcuately of the rail.

32. In a vehicle supporting rack, a rail, means mounting said rail in a substantially horizontal position, a runway extending transversely of and above said rail, a roller having an axis of rotation and a channeled surface circumscribing said axis, means mounting said roller on said runway with its axis disposed longitudinally of the runway and with said surface in engagement with said rail whereby the runway is mounted for substantially horizontal movement with the roller rolling on the rail and for elevational movement with said roller moving circumferentially of the longitudinal axis of the rail, and means for resisting movement of said runway relative to said rail.

33. The rack of claim 32 wherein said resisting means l engages the rail in circumferentially spaced relation to the roller in order to frictionally grasp said rail between said roller and said resisting means.

34. In a vehicle supporting rack, a rail having an upper convex surface, means mounting said rail in a substantially horizontal position, a runway extending transversely of and above said rail, a roller having an axis of rotation and a concave surface of revolution circumscribing said axis, and means rotatably mounting said roller on said runway with its axis disposed longitudinally of the runway and with said surface of revolution in complementary engagement with said rail whereby the runway is mounted for substantially horizontal and elevational movement, said roller rolling on said rail during said horizontal movement and moving circumferentially of the longitudinal axis of the rail during said elevational movement, said 2.2 means also mounting said roller for movement lengthwise of the runway.

3S. The rack of claim 22 including means for preventing movement of the runways along the rail means.

36. in a vehicle supporting rack, an elongated rail having an upper convex surface, means mounting said rail in a substantially horizontal position, a runway extending transversely of and above said rail, a roller having an axis of rotation and a surface of revolution circumscribing said axis, and means mounting said roller on said runway with its axis longitudinally of the runway and with said surface of revolution in engagement with said rail whereby the runway is mounted for substantially horizontal movement with the roller rolling on the rail and for elevational movement with said roller moving circumferentially of the longitudinal axis of the rail.

37. In a vehicle supporting rack, first and second Substantially cylindrical rails, means mounting the rails in substantially parallel relation to each other and in substantially horizontal positions with the second rail at a lower elevation than the rst rail, an inclined runway disposed transversely of the rails, a rst pair of rollers mounted on the runway and having channeled surfaces engaging the iirst rail, a second pair of rollers mounted on the runway and having channelled surfaces engaging the second rail, all of the rollers having their axes of rotation disposed lengthwise of the runway so that the rollers mount the runway for movement along the rails, the channelled rollers bearing against the rails and preventing downward movement of the runway Ialong the incline thereof, and means mounted on the runway and extending under each rail for releasably applying pressure against the rail to lock the runway against movement along the rails.

References Cited bythe Examiner UNITED STATES PATENTS 1,017,749 2/12 Gunther IS7-8.71 1,100,011 6/14 Darby et al 187-8.71 1,525,447 2/25 Hose 269-58 1,955,586 4/34 Hott et al. 187-8.52 1,973,803 9/34 Frauen 269-58 2,025,051 12/ 35 Haucke 33-203.12 2,168,624 8/39 Musgrave 187-8.67 2,456,646 12/48 Patterson IS7-8.49 2,567,335 9/51 Hebert.

2,569,982 10/51 Estel IS7-8.52 2,592,919 4/52 Loomis et al. 14-71 2,643,162 6/53 Barr 308-6 2,758,385 8/56 Martin 33-203.12 2,892,513 6/59 Carrigan IS7-8.43 2,903,047 9/ 59 Funyak 248-430` 2,928,701 3/60 Ferdig 308-190 2,956,645 10/ 60 Halstead 187-8.67 2,962,980 12/ 60 Carrigan IS7-8.67 3,018,496 1/62 Hosbein 14-71 FOREIGN PATENTS 113,610 5 26 Switzerland.

SAMUEL F. COLEMAN, Primary Examiner.

ANDRES H. NIELSEN, Examiner. 

1. IN COMBINATION, MOUNTING MEANS, ELONGATED, SUBSTANTIALLY HORIZONTAL, FRONT AND REAR RAILS BORNE BY SAID MOUNTING MEANS IN OPPOSED, TRANSVERSELY SPACED, SUBSTANTIALLY PARALLEL RELATION TO EACH OTHER, AN ELONGATED VEHICLE SUPPORT HAVING OPPOSITE END PORTIONS ADJACENT TO SAID RAILS ROLLERS INDIVIDUALLY ROLLABLY ENGAGING SAID RAILS FOR ROLLING MOVEMENT THEREALONG AND BEING CONNECTED TO SAID SUPPORT FOR ROTATION RELATIVE TO SAID SUPPORT ABOUT AXES EXTENDED TRANSVERSELY OF SAID RAILS, SAID RAILS AND ROLLERS HAVING SUBSTANTIALLY COMPLEMENTARILY ENGAGING CONVEX AND CONCAVE SURFACES, ELEVATIONAL ADJUSTMENT OF ONE OF THE END PORTIONS OF SAID SUPPORT RELATIVE TO ITS OPPOSITE END PORTION BEING ACCOMMODATED BY THE ENGAGING CONVEX AND CONCAVE SURFACES ADJACENT TO SAID ONE END PORTION, AND POWERED MEANS FOR EFFECTING SAID ELEVATIONAL ADJUSTMENT. 